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Cs-Nb/SiO2酸碱双功能催化剂催化羟醛缩合制MMA性能研究
Study on catalytic performances of Cs-Nb/SiO2 acid-base bifunctional catalysts in aldol condensation to MMA
- 低碳化学与化工 2026, 51(3): 53-59.
- 作者机构：
西南化工研究设计院有限公司 国家碳一化学工程技术研究中心，多孔材料与分离转化全国重点实验室， 四川 成都 610225
- 作者简介：
丁明月（1993—），硕士，工程师，研究方向为低碳化工技术，E-mail：dingmingyue@swchem.com。
王光永（1989—），博士，正高级工程师，研究方向为低碳化工技术，E-mail：wangguangyong@swchem.com。
- 基金信息：
DOI：10.12434/j.issn.2097-2547.20250168
中图分类号： TQ225;TQ426收稿：2025-04-09，
修回：2025-05-23，
纸质出版：2026-03-25
- 稿件说明：
移动端阅览
丁明月,彭颖娟,王光永等.Cs-Nb/SiO2酸碱双功能催化剂催化羟醛缩合制MMA性能研究[J].低碳化学与化工,2026,51(3):53-59.
DING Mingyue,PENG Yingjuan,WANG Guangyong,et al.Study on catalytic performances of Cs-Nb/SiO2 acid-base bifunctional catalysts in aldol condensation to MMA[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(3):53-59.
丁明月,彭颖娟,王光永等.Cs-Nb/SiO2酸碱双功能催化剂催化羟醛缩合制MMA性能研究[J].低碳化学与化工,2026,51(3):53-59. DOI： 10.12434/j.issn.2097-2547.20250168.
DING Mingyue,PENG Yingjuan,WANG Guangyong,et al.Study on catalytic performances of Cs-Nb/SiO2 acid-base bifunctional catalysts in aldol condensation to MMA[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(3):53-59. DOI： 10.12434/j.issn.2097-2547.20250168.
摘要
羟醛缩合制甲基丙烯酸甲酯（MMA）反应中，催化剂常因积炭而导致稳定性变差。催化剂表面的强酸、强碱性位点是导致催化剂积炭的重要因素，可采用消除催化剂表面强酸、强碱性位点的方法提高催化剂的稳定性。以SiO
2
为载体，Cs为活性组分，Nb、V或P为活性助剂，制备了一系列酸碱双功能催化剂。采用XRD、TPD和N
2
吸/脱附等研究了活性助剂种类、Cs含量（
m
(Cs)/
m
(载体)）对催化剂晶体结构、酸碱性和织构性质的影响，并研究了催化剂的羟醛缩合制MMA催化性能和稳定性。结果表明，在
n
(甲醛):
n
(丙酸甲酯) = 1:3、温度为340 °C、压力为0.2 MPa和原料进料量为0.2 mL/min的条件下反应48 h，Cs含量为10.0%的催化剂（Cs10.0-Nb/SiO
2
）表现出良好的催化性能，其产物（MMA +甲基丙烯酸）选择性为93.4%，产物收率为21.3%。以NH
3
选择性覆盖强酸性位点并反应96 h后，Cs10.0-Nb/SiO
2
的产物收率和产物选择性分别为20.2%和91.5%，略优于原始Cs10.0-Nb/SiO
2
。
Abstract
During aldol condensation to methyl methacrylate (MMA)
the catalyst often has poor reaction stability due to carbon deposition. The strong acid and strong base sites on surface of the catalyst are important reasons for carbon deposition on catalyst
and the method of eliminating the strong acid and strong base sites on surface of the catalyst can be used to improve stability of the catalyst. A series of acid-base bifunctional catalysts were prepared with SiO
2
as the support
Cs as the active component and Nb
V or P as the active additives. Effects of types of active additives and Cs contents (
m
(Cs)/
m
(support)) on the crystal structures
acidities and alkalinities and textural properties of the catalysts were investigated by XRD
TPD and N
2
adsorption/desorption
and the catalytic performances and stabilities of the catalysts in aldol condensation to MMA were also studied. The results show that under the conditions of
n
(formaldehyde):
n
(methyl propionate) of 1:3
temperature of 340 ℃
pressure of 0.2 MPa and raw material feed rate of 0.2 mL/min for 48 h
the catalyst with Cs content of 10.0% (Cs10.0-Nb/SiO
2
) demonstrates excellent catalytic performance
with the product (MMA + methacrylic acid) selectivity
of 93.4% and the product yield of 21.3%. After selectively covering strong acid sites with NH
3
and reacting for 96 h
the product yield and product selectivity of Cs10.0-Nb/SiO
2
are 20.2% and 91.5%
respectively
slightly better than the original Cs10.0-Nb/SiO
2
.
关键词
Keywords
references
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